FILE - In this Sept. 1, 2012, file photo, Rep. Steve Chabot speaks at a campaign rally in Cincinnati. The immigration debate is threatening to split the Republican Party, pitting those who focus mainly on presidential elections against those who care mostly about congressional races. Granting illegal residents a path to citizenship, which critics call "amnesty," is deeply unpopular in many House Republicans' districts. However, President Barack Obama wants such a pathway. Chabot opposes giving illegal immigrants an eventual route to citizenship. (AP Photo/Al Behrman, File)